OBSIDIAN 53 
Table 2. Continued. 
Sample 66 46 379 1514/2 
a nnn nee EEE sSSSS nS 
Trace elements (ppm) 
Ba 383.8 436.9 480.3 bdl 
Rb 194.5 194.7 195.4 132.4 
or 21.8 Dawe 30.8 bdl 
Pb 22:6 22.7 23.8 26.3 
Th Ze 19,3 |e, 14.2 
Zr 133.5 133.8 136.7 1015.7 
¥; 36.2 85,7 34.2 12930 
La 36.0 36.9 36.6 86.2 
V bdl ait bdl bdl 
Cr na! bdl 7.4 bdl 
Ni bdl bdl 8.2 8.3 
Cu 5.6 9.8 12.8 bdl 
Zn 38.3 38.0 37.3 e211 
SS See ee 
Sample 504 54 105 444 
Major elements — wt. % (elemental wt. 7%) 
SiO, 74.36 (34.8) 72.27 (33.8) 73.74 (34.5) 75.53 (34.4) 
TiO, 0.22 (1319) 0.22 (1319) 0.22 (1319) 0.20 (1199) 
Al,O3 10.60 (2.81) 9.75 (2.58) 10.51 (2.78) 9.69 (2.56) 
Fe,0;* 4.56 ce 4.47 5.46 
MnO 0.09 (697) 0.13 (1007) 0.09 (697) 0.11 (852) 
MgO 0.09 0.12 0.12 0.09 
CaO 0.21 (0.15) 0.21 (0.15) 0.20 (0.14) 0.20 (0.14) 
Na,O 5.73 (2.13) 6.22 (2.31) 5.75 (2.13) 5.89 (2.19) 
K,O 4.44 (1.84) 4.28 (1.78) 4.40 (1.83) 4.39 (1.82) 
P20; 0.02 0.03 0.02 0.02 
H,O0 0.02 0.12 0.02 0.05 
LOI 0.05 0.21 0.20 0.03 
Total 100.40 99.48 99.75 99.67 
Trace elements (ppm) 
Ba bdl bdl 49.8 bdl 
Rb 133.2 130.5 131.2 142.4 
Sr Zeh bdl bdl bdl 
Pb 26.2 26.7 25.6 27.3 
Th 17.8 15.1 13.3 13.7 
LX 1001.8 1081.0 989.4 1171.2 
Y 124.6 139.4 122.8 143.2 
La 91.7 91.9 89.0 99.2 
V bdl 0.9 bdl bdl 
Cr bdl bdl bdl bdl 
Ni 8.2 6.1 9.3 bdl 
Cu 8.4 6.4 10.2 bdl 
Zn 215.4 256.9 213.2 253.0 
bdl = below detection limit. Fe,O,* = total iron reported as Fe,O, 
